has part has part output of output of sperm sperm ejaculation organism substance semen http://upload.wikimedia.org/wikipedia/commons/4/40/Human_semen_in_petri_dish2.jpg ejaculate MA:0002522 UMLS:C2756969 Organism substance that is composed of sperm cells suspended in seminal fluid. Note that in this ontology, semen is defined as the sum of sperm and seminal fluid, where seminal fluid is defined in taxonomically generic way (see comments for UBERON:0006530). FMA:62966 CALOHA:TS-0917 NCIT:C13277 MESH:D012661 Wikipedia:Semen seminal BTO:0001230 UBERON:0001968 GAID:1169 sperm EMAPA:31488 UMLS:C1518159 NCIT:C13713 seminal fluid